diff --git a/libavcodec/wmaprodec.c b/libavcodec/wmaprodec.c
index 422478542d..5396733dce 100644
--- a/libavcodec/wmaprodec.c
+++ b/libavcodec/wmaprodec.c
@@ -528,7 +528,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
     /** calculate subwoofer cutoff values */
     for (i = 0; i < num_possible_block_sizes; i++) {
         int block_size = s->samples_per_frame >> i;
-        int cutoff = (440*block_size + 3 * (s->avctx->sample_rate >> 1) - 1)
+        int cutoff = (440*block_size + 3LL * (s->avctx->sample_rate >> 1) - 1)
                      / s->avctx->sample_rate;
         s->subwoofer_cutoffs[i] = av_clip(cutoff, 4, block_size);
     }